Chemical and photochemical synthesis of substituted dihydro-thieno[2',3':4,5]thieno[2,3-c]quinolin-6-ones and tetrahydro-dithieno[2,3-b:2',3'-d]thieno[2',3'c:2',3'c']diquinolin-6,14-dione

Some new substituted dihydrothieno2',3':4,5]thieno2,3-c]quinolin-6-ones 9- 12 and tetrahydrodithieno2,3-b: 2',3'-d]thieno2',3'-c:2',3'-c']diquinolin-6,14-dione (17) were prepared from the corresponding new anilides 5-8 and from the corresponding dianilide 15, respectively, by a multistep combination of chemical and photochemical reactions. All the prepared compounds are of particular interest because they might serve as DNA intercalators in anticancer therapy.